Rubio looks to find his opening in the 2016 Republican field

WASHINGTON (AP) — If Marco Rubio launches his presidential campaign as expected Monday, the first-term Republican senator from Florida may have to answer this simple question. Why now? The 43-year-old Rubio, a rising star on Capitol Hill, could wait four more years, even eight, and still be a relatively young candidate. Some party officials want him run for governor or try to hold his Senate...